City to lose $20 million in savings, pairing craft beer and community and what we learned this week.

Clean-tech innovators like biofuel and solar energy companies have growing footholds in San Diego. But the sector also faces difficulties that could sap momentum.

The promise of a next-generation biofuel is so enticing that even the world’s biggest oil companies are investing in the very product that could make our reliance on fossil fuels go the way of the dinosaur.